I have a solution for this problem, as it happens to me all the time. It's a little complicated to explain, but easy to do after once or twice:
When the "short preview" comes up, right click the one line that is visible and choose "Inspect Element".
This will open a window, and hopefully the line highlighted contains the text "height: 20px" If not, try again.
Right click that exact phrase, and choose Edit Attribute. Click the 20 and then add a zero so that height: 200px and then close that new window with the Circle X in the top right corner.
Wha-la, you now have a usable preview. :)